1/5x-1/2(3-2x)=1 1/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/25

问题描述:

1/5x-1/2(3-2x)=1 1/7(2x+14)=4-2x 3/10(200+x)-2/10(300-x)=300x 9/25
1/5x-1/2(3-2x)=1
1/7(2x+14)=4-2x
3/10(200+x)-2/10(300-x)=300x 9/25

1/5x-1/2(3-2x)=1两边乘102x-15+10x=112x=16x=4/31/7(2x+14)=4-2x 两边乘72x+14=28-14x2x+14x=28-1416x=14x=14÷16x=7/83/10(200+x)-2/10(300-x)=300x+9/25两边乘503000+15x-3000+10x=15000x+1814975x=-18x=-18/1497...